Safety window lock



Oct. 28, 1947. E. B. EVANS 2,

SAFETY WINDOW LOCK Filed March 9, 1945 2 Shets-Sheet 1 INVENTOR.

Oct. 28, 1947. v E. B. EVANS SAFETY WINDOW LOCK Filed March 9, 1945 2Sheets-Sheet 2 INVENTOR. zf/merfi' Ed 776 ATTORNEYS Patented Oct. 28,1947 UNITED STATES PATENT OFFICE SAFETY WINDOW LOCK Elmer B. Evans, LosAngeles, Calif.

Application March 9, 1945, Serial No. 581,808

1 Claim. (Cl. 292-182) My present invention in its broad aspect, has todo with improvements in window or sash locks, and more particularly, itis my purpose to use a friction locking member to engage an element ofthe window frame, and a cam lever for moving the friction element inengagement with the frame, and spring means for releasing the lock whenthe cam lever is moved to an inoperative position. Furthermore, Iprovide a lock for both the lower and upper sash, the lock for the uppersash being countersunk, and my lock is simple, sturdy, practical andeasily mounted on a conventional window sash and has no parts which arelikely to bind or stick, or become broken or deranged or out of order.

Other and equally important objects and advantages of my invention willbe apparent from the following description and drawings, and it is to beunderstood that changes in form, size, shape, materials, andconstruction and arrangement of parts is permissible and within thepurview of my broad inventive concept and the scope of the appendedclaim.

In the drawings wherein I have illustrated a preferred form Of myinvention:

Figure 1 is an elevation, partly fragmentary of my-lock applied to alower sash;

Figure 2 is a section on the line 22 of Figure 1;

Figure 3 is a section on the line 3-3 of Figure 1;

Figure 4 is a top plan view of my lower sash lock with the cover plateremoved to show theoperating parts;

. Figure 5 is a section on the line 5-5 of Figure 1;

Figure 6 is an elevation, partly broken away, to show my upper sash lockapplied;

Figure 7 is a plan view of my upper sash lock with the cover removed toshow the working parts;

Figure 8 is a section on the line 88 of Figure 6,

and

Figure 9 is a section on the line 9-9 of Figure 6.

In the drawings wherein like characters of reierence are used todesignate like or similar parts:

The numeral l designates a window frame and 2 the stop strip, while 3and 4 designate the upper and lower sash respectively, each having siderails 5. 'The window and sash are of conventional construction.

Mounted on the side rail 5 of the lower sash 4 to engage the stop strip2 is my sash lock'i which has a casing 1 formed with a flat base section8 with along flange 9 on one side edge and a short flange H) on theother side edge, these flanges being bent to form edge locking lips llengaging in recesses I2 in the side walls of the top cover plate IIwhich has an open front and back end. The casing is held in place on theside rail 5 by screws M. The operating parts are mounted on the basesection 8. and include an arcuate locking foot having a. serrated ortoothed ed8e IB'to covered as at lGa if desiredand is rotatably held inplace by a rivet lI passing through the plate I8 and having a squarehead IS. The foot has an upstanding lug 20 engaged by a spring 2| whichhas a straight portion 22 passing through a slot 23 in upstanding flange24 on the plate It to engage a rivet 25 on which is rotatably mounted acam lever'26, the cam element 21 of which bears against the flange 24 ofplate ill to move the foot into and out of engagement with the stopstrip 2. The plate has an attaching lug 2B engaging in a slot in thebase section 8. In operation, the foot is normally returned toinoperative position by the spring 21 but iscammed to a locking positionby the lever 26.

The casing 29 of my upper sash lock is similar to the casing of thelower sash lock, but it is countersunk as shown in Figures 8v and 9 inthe sash rail to lie flush with the surface thereof. An angular cammingplate 30 has an operating lever 3| passing through a slot 32 in thecover plate and is movable to engage the angular camming end 33 of theplate 34 for actuating the foot which engages the adjoining windowframe-see Figure 8-instead of the stop strip 2.

From the foregoing, it is believed that'the operation and advantages'ofmy invention will be apparent, but it is again emphasized thatinterpretation of its scope should only be conclusive I claim:

A window lock, comprising a casing, an arcuate locking foot, a plate onthe casing on which the foot is pivotally mounted, the plate having anupstanding end flange a vertical slot in said flange, a camming lever, arivet pivotally mounting the camming lever in the casing, a springpassing through the slot in said flange to engage the pivot for the footat one end and the rivet at the other, and the camming lever movable toengage the flange on the plateto urge the plate and foot into lockingposition against the tension of the spring, a slot formed in said casingunderlying said plate and a lug on said plate for engagement in saidslot to prevent lateral displacement of said plate.

ELMER B. EVANS.

REFERENCES crrnn The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 111,524 Drott i Feb. '1, 1871788,165 McFadden Apr. 27, 1905 1,103,229 Vance July 14, 1914 1,626,007Mitchell Apr. 26, 1927

